Ignition-dynamo.



C. T. MASON.

IGNITION DYNAMO.

APPLICATION men SEPT. 15. 1916.

1,234, 1 92. Patented July 24, 1917.

UNITED STATES PATENT OFFICE.

CHARLES THOMAS MASON, OF SUMTER, SOUTH CAROLINA, ASSIGNOB TO SPLITDORF ELECTRICAL OOMIANY, 0F NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

IGNITION-DYNAMIC.

Specification of Letters Patent.

Patented July 24, 191 7.

Application filed September 15, 1916. Serial No. 120,324.

To all whom it may concern Be it known that I, Omnnns THOMAS Mason, a citizen of the United States, residing at Sumter, in the county of Sumter and State of South Carolina, have invented certain new and useful Improvements in Ignition-Dynamos, of which the following is a specification, reference being had to the accompanying drawing.

The invention relates to new and useful improvements in electric generators, and particularly to that class of generators used for igniting the charge in internal combustion engines which are generally termed magnetos.

An object of the invention is to provide a magneto of the above character having a flux creating element and a flux receiving element with which is associated a current generating coil, with devices for simultaneously adjusting the means which shifts the flux from the flux creating element to the fiux receiving element and the devices which operate the interrupter for the generating coil.

A further object of the invention is to provide a magneto of the above character having a permanent'magnet, a rotor, a current generating coil, and a core therefor in inductive relation to the rotor, with means whereby the rotor may be adjusted angularly relative to its operating mechanism for timing purposes.

A still further object of the invention is to provide a magneto of the above type wherein the cam for actuating the interrupter is carried by the rotor so that said actuating cam and rotor may be simultaneously adjusted for timing purposes.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings, which show by way of illustration one embodiment of the invention:-

Figure 1 is a sectional-view through a magneto having my improvements applied thereto, and also showing a hand lever for operating the same;

Fig. 2 is a view, showing more or less diagrammatically, the current generating coil, the windings therefor, the interrupter associated with said coil. and the means for operating said interrupter from the rotor;

Fig. 3 is a plan view of the operating shaft for the rotor;

. Fig. 4 is a plan view of the rotor showing the cam slot whereby said rotor is shifted on its operating shaft;

Fig. 5 is a plan view of the shifting rod for shifting the rotor on its operating shaft.

The invention is directed particularly to a magneto for ignition purposes wherein a current generating coil is provided with a core in inductive relation to a rotor cooperating with a permanent magnet and furnishing the flux of said magnet by said core. Associated with the core is an inter rupter operating to break the primary circuit at the time of ignition. The rotor is mounted on an operating shaft and carries a cam for actuating the interrupter. This rotor is capable of being shifted angularly on its operating shaft and when so shifted the time of a spark in the engine cylinder may be either retarded or-advanced, de pending upon the directionof shifting of the rotor relative to its operating shaft. This brings about a simultaneous adjustment of the position of the rotor and the interrupter cam so that the rotor will be in position for maximum spark when said spark is advanced or retarded.

Referring more in detail to the drawingsz- My improved magneto consists of a permanent magnet 1 having oppositely disposed and parallel pole faces. Each pole face is provided with an opening 2 in which is mounted a supporting frame 3 having bearings for the shaft 4 which extends through the pole faces. This shaft 4 carries a rotor 5. The rotor 5 is formed with the usual rotor wings and the spaces in and about the wings are filled with brass, the Whole member being cylindrical. This rotor operates between the pole pieces 6 and 7 of a core 8 which is made in the usual wayand on this core 8 is mounted a generating coil 9.

The generating coil consists of a rimary winding 10 and a secondary win ing 11. One terminal of the primary winding 10 leads to a contact 12, while the other terminal is connected to the secondary winding. The secondary windin is connected to the ignition terminals, in icated at 13 in Fig. 2 of the drawings, One of these ter minals is grounded. Coiiperating with the contact 12 is a movable contact 14 carried by a lever 15. The rotor 5 is provided with cams 16 and 17 which engage the lever 15, and these cams operate to separate the contacts 12 and 14 at the proper time for prod ucing thespark at the spark terminals 13,

The shaft 1 is provided with a recess 18 and also with cam slots 19 and 19. The rotor assembly is provided with cam slots 20 and 20. Located within the recess 18 is a rod 21 which is provided with an opening 22 and a pin 23 extends through this opening in the rod 21 and through the slots 19,19, 20 and 20. These slots are so formed that a movement of the rod 21 endwise in one direction will shift the rotor assembly angularly in one direction relative to the supporting shaft therefor, while a movement of the rod in the other direction will shift the rotor assembly in the opposite direction. It will be readily seen that when the rotor assembly is shifted, the interrupter cam is also shifted. This interrupter cam is so shaped as to actuate the interrupter in the proper time in the rotation of the rotor relative to the core 8 as to produce a maximum spark. After these parts have once been properly adjusted, it will be apparent that all adjustments for either an advanced or a retarded spark will give a maximum spark.

The rod2l is moved endwise, as herein shown, by a hand lever 24 which is connected by-a link 25 to a yoke 26. This yoke 26 is pivoted to a collar 27, and this collar 27 fits in a groove 28 and in the rod 21. This permits the rod to rotate freely with the shaft, and also permits the rod to be moved endwise when it is rotated. It is understood, of course, that the magneto shaft is connected to the engine shaft and maintains a certain definite relation thereto and, as a consequence, a certain definite relation to the position of the piston in the engine, and, therefore, the shifting of the rotor relative to its shaft, which is operated in a predetermined timed relation with the piston, will advance or retard the spark.

It is obvious that minor changes in the details of construction and the arrangement of parts may be made without departing from the spirit of the invention, as set forth in the appended claims.

Having thus described the invention, what is claimed as new is 1. An ignition magneto including in combination, a flux creating element, a flux receiving element, a current generating coil carried by said flux receivin element, an interrupter associated with said coil, an interrupter operating device, means for shifting the flux from the flux creating element to the flux receiving element, and means for simultaneously adjusting the interrupter opcrating device and the flux shifting means for timing purposes.

2. An ignition magneto including in combination, a permanent magnet, a flux receiving core, acoil carried by said core, an interrupter associated with said coil, an interrupter operating device, a rotor for supplying the flux to the core, and means for simultaneouslyadjusting the interrupter opcrating device and the rotor for timing purposes.

3. An ignition magneto including in combination, a permanent magnet, a core, a current generating coil carried by the core, a rotor for furnishing the flux to said core, a positively driven shaft supporting said rotor, and means for shifting said rotor angularly about said shaft 'for timing purposes.

4. An ignition magneto including in com,- bination, a permanent magnet having spaced parallel pole faces provided with openings therethrough, a positively driven shaft extending through said openings, a rotor mounted on said shaft, a normally stationary current generating coil, a core therefor in inductive relation to said rotor, and means for angularly adjusting said rotor on said shaft for timing purposes.

5. An ignition magneto including in. combination, a ermanent magnet having spaced parallel po e faces provided with openings therethrough, a shaft extending through said openings, a rotor. mounted on said shaft, a normally stationary current generating coil, a core therefor in inductive relation to said rotor, and means for angularly adjusting said rotor on said shaft for timing purposes, said last-named means including a rod movable endwise in a recess formed in the shaft of said rotor, a pin carried by said rod, a cam slot formed in said shaft, and a cam slot formed in the rotor, whereby when said rod is moved endwise said rotor is shifted on said shaft.

6. An ignition magneto including in combination, a permanent magnet, a rotor mounted to rotate about an axis at right angles to the pole faces of said magnet, a current generating coil, an interrupter associated therewith, a core on which said coil is mounted, said core having inductive relation to the rotor, an interrupter operated cam mounted on the rotor, means for rotating said rotor, and means for shifting the rotor angularly relative to its operating means for timing purposes.

7. An ignition magneto including in combination, a permanent magnet, a rotor mounted to rotate about an axis at right angles to the pole faces of said magnet, a current generating coil, an interrupter associated therewith, a core on which said coil is mounted, said core having inductive rela tion to the rotor, an interrupter operated cam mounted on the rotor, means for rotatthrough said cam slots whereby endwise ing said rotor, a shaft on which said rotor movement of the rod shifts the rotor on its is mounted, said shaft havin a recess operating shaft. 10 formed therein, a rod extending ingthwise In testimony whereof I hereunto afiix my of said recess, a cam slot formed in said signature.

shaft, a cam slot formed in the rotor, and a pin carried by the rod and extending CHARLES THOMAS MASON.

Copies of this patent may be obtained for live cents each, by addressing the "Commissioner 01' I'atents, Washington, D. G. 

